VEGAPULS WL 61 - 4 … 20 mA/HART - two-wire

9 Diagnosis, Asset Management and service9 Diagnosis, Asset Management and service9.1 MaintenanceIf the device is used correctly, no maintenance is required in normaloperation.9.2 Measured value and event memoryThe instrument has several memories which are available for diagnosispurposes. The data remain even with voltage interruption.Measured value memoryEvent memoryUp to 60,000 measured values can be stored in the sensor in a ringmemory. Each entry contains date/time as well as the respectivemeasured value. Storable values are for example:• DistanceFilling heightPercentage value• Lin. percent• ScaledCurrent value• Meas. reliability• Electronics temperatureWhen the instrument is shipped, the measured value memory isactive and stores distance, measurement certainty and electronicstemperature every 3 minutes.The requested values and recording conditions are set via a PC withPACTware/DTM or the control system with EDD. Data are thus readout and also reset.Up to 500 events are automatically stored with a time stamp in thesensor (non-deletable). Each entry contains date/time, event type,event description and value. Event types are for example:Modification of a parameter• Switching on and off timesStatus messages (according to NE 107)• Error messages (according to NE 107)The data are read out via a PC with PACTware/DTM or the controlsystem with EDD.38061-EN-121011Echo curve memoryVEGAPULS WL 61 • 4 … 20 mA/HART - two-wireThe echo curves are stored with date and time and the correspondingecho data. The memory is divided into two sections:Echo curve of the setup: This is used as reference echo curve forthe measurement conditions during setup. Changes in the measurementconditions during operation or buildup on the sensor can thusbe recognized. The echo curve of the setup is stored via:• PC with PACTware/DTMControl system with EDD• Indicating and adjustment module33